Question

why do all the metal polished before the experiment
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Answer 1

Answer:

Metal pieces get tall is before the experiment because to remove the metal oxide ! Metal prices are polished before the experiment because to remove the topmost layer of it as when the metal is burnt the metal oxide will prevent the metal piece from further oxidation.

Answer 2

Answer:

AS THE RUST CONTAINS IMPURITIES AND WATER AND STUFF WHICH CAN HAMPER EXPERIMENT'S OUTCOME